Use of uninitialized value $sym8 in string eq at ./b.pl line 39, <DATA> line 4.
A       exchangeB_groupA(ln4)   not found
A       exchangeC_groupA(ln7)   not found
Use of uninitialized value $sym8 in string eq at ./b.pl line 39, <DATA> line 40.
ADF     exchangeB_groupA(ln4)   not found
ADF     exchangeC_groupA(ln7)   not found
Use of uninitialized value $sym8 in string eq at ./b.pl line 39, <DATA> line 52.
BFD     exchangeB_groupA(ln4)   not found
BFD     exchangeC_groupA(ln7)   not found
Use of uninitialized value $sym8 in string eq at ./b.pl line 39, <DATA> line 88.
ZZD     exchangeB_groupA(ln4)   not found